20308995 has 32 divisors (see below), whose sum is σ = 41264640. Its totient is φ = 9283680.

The previous prime is 20308993. The next prime is 20309057. The reversal of 20308995 is 59980302.

It is not a de Polignac number, because 20308995 - 2¹ = 20308993 is a prime.

Together with 20955645 it forms an amicable pair .

It is not an unprimeable number, because it can be changed into a prime (20308991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9801 + ... + 11690.

It is an arithmetic number, because the mean of its divisors is an integer number (1289520).

Almost surely, 2^20308995 is an apocalyptic number.

20308995 is an abundant number, since it is smaller than the sum of its proper divisors (20955645).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20308995 is a wasteful number, since it uses less digits than its factorization.

20308995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21512 (or 21506 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20308995 is about 4506.5502327168. The cubic root of 20308995 is about 272.8325261926.

It can be divided in two parts, 2030 and 8995, that added together give a square (11025 = 105²).

The spelling of 20308995 in words is "twenty million, three hundred eight thousand, nine hundred ninety-five".